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Outdoor reset on a outdoor boiler?

Thoughts on running an outdoor reset on a outdoor furnace? I haven't really seen many mention the use of these together.


  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
    Probably a bad idea. Better is a large storage tank charged by the outdoor boiler, and run reset via mixing to the emitters.

    There was an error rendering this rich post.

  • Ironman
    Ironman Member Posts: 7,397
    You don't want the boiler water temp to get below 150* or you'll have flue gas condensation which will rot the boiler.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • mustang_gt_350
    mustang_gt_350 Member Posts: 25
    Alright, I never thought about condensation. Could be why i have not really heard of anyone using them
  • hot_rod
    hot_rod Member Posts: 22,467
    Most outdoor wood boilers have a large water content to store energy, so running them hot allows you to store the most amount of heat energy.

    The Euro type wood and pellet boilers have ODR built into the control. As long as you assure return above 140F you could reset.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream